Question

Give two examples for each of the following cases:
(a) Physical changes which are reversible.
(b) Physical changes which are not reversible.
(c) Chemical changes.

Answer 1

(a) (i) Folding of paper (ii) Melting of ice.
(b) (i) Tearing of paper. (ii) Breaking of glass.
(c) (i) Reaction between vinegar and baking soda. (ii) Burning of a match stick.

There are many other examples in each case which can be given.